Exhibit 99.1

FOR IMMEDIATE RELEASE

PLEXUS REPORTS RECORD $2.01B REVENUE WITH 25% GROWTH FOR FISCAL 2010

Record Fiscal Fourth Quarter Revenue of $556 Million, EPS of $0.65

Initiates Q1 Revenue Guidance of $550 - $580 Million

NEENAH, WI, October 27, 2010 — Plexus Corp. (Nasdaq: PLXS) today announced:

     Fiscal 2010 Results:

• Revenue: $2.01 billion, up 25% over prior year

• Diluted EPS: $2.19 including $0.23 per share of stock-based compensation expense

• Return on invested capital (ROIC): 19.5%

     Q4 Fiscal 2010 Results (quarter ended October 2, 2010):

• Revenue: $556 million, relative to guidance of $530 to $555 million

• Diluted EPS: $0.65, including $0.06 per share of stock-based compensation expense, relative to guidance of $0.58 to $0.63

     Q1 Fiscal 2011 Guidance:

• Revenue: $550 to $580 million

• Diluted EPS: $0.56 to $0.62, excluding any restructuring charges and including approximately $0.06 per share of stock-based compensation expense

Dean Foate, President and CEO, commented, “Fiscal year 2010 was an excellent year for Plexus. We delivered revenue growth of 25%, ending the year at a record $2.01 billion. Return on invested capital improved to 19.5%, moving this key financial metric in line with our 20% target. Our exceptional organic revenue growth, coupled with our strong economic profit performance, were outstanding achievements during a period with a continuing sluggish macroeconomic environment.”

Mr. Foate added, “Our fiscal fourth quarter performance was at the higher end of expectations, resulting in a strong finish to fiscal year 2010. Revenue grew 3.6% sequentially to $556 million, a record result. Earnings leverage was strong with EPS of $0.65, up 10% over the prior quarter.”

Mr. Foate continued, “During the fiscal fourth quarter we won 24 new manufacturing programs that we anticipate will generate approximately $115 million in annualized revenue. For the full fiscal year we won approximately $501 million in annualized revenue for our manufacturing solutions group, which is based on customer forecasts when ramped to full production and is subject to risks around the timing and ultimate realization of anticipated revenues. Our engineering solutions group continues to build a healthy book of business, winning approximately $21 million of new engineering programs during the fiscal fourth quarter, a record result and strong confirmation of the value of our Product Realization capabilities and brand.”

Ginger Jones, Vice President and CFO, commented, “Gross and operating margins were 10.1% and 5.2%, respectively, for the fiscal fourth quarter, consistent with our expectations when we set guidance for the quarter. Importantly, we have delivered strong financial results for the full fiscal year that are in line with our target financial model of 20% ROIC, 10% gross margin and 5% operating margin.

Our tax rate for fiscal 2010 was 1%. This was lower than the 2% tax rate used when we established our guidance for this quarter due to the regional mix of earnings in the fiscal fourth quarter. Consequently, diluted EPS for the quarter was $0.02 higher than we would have anticipated. Fiscal fourth quarter cash cycle days were 75 days, consistent with the fiscal third quarter cash cycle days.”

Mr. Foate added, “While we delivered a strong finish to fiscal 2010, we currently anticipate that the first half of fiscal 2011 will present some headwinds before returning to stronger growth and operating performance in the second half. Our current view is that our 2011 fiscal first quarter revenue will be flat to modestly higher than the fiscal fourth quarter of 2010. We are establishing fiscal first quarter 2011 revenue guidance of $550 to $580 million with EPS of $0.56 to $0.62, excluding any restructuring charges and including approximately $0.06 per share of stock-based compensation expense. Looking ahead to the fiscal second quarter, we currently anticipate a somewhat challenging quarter as we ramp down production for two customers that were acquired during the past year, as previously disclosed, and that will transition out of Plexus while we absorb structural seasonal operating cost increases, including salary adjustments, during the quarter. Looking to the second half of fiscal 2011, we currently anticipate returning to strong growth as we ramp a number of new programs won in recent quarters and we expect operating performance to be consistent with our long-term financial model.”

Mr. Foate concluded, “I believe that our robust recovery in fiscal 2010, both in organic revenue growth and financial results, helps demonstrate that our industry leadership in delivering mid-to-low volume, higher complexity Product Realization Value Stream Solutions comprises a unique value proposition that helps create competitive advantage for our customers. We remain committed to our enduring goals of delivering long-term organic growth of 15% and generating economic profit for our shareholders. Our confidence in our long-term growth opportunities compels us to proceed with capacity investments required to serve our customers.”

Plexus provides non-GAAP supplemental information. Non-GAAP income statements exclude transactions such as restructuring costs that are not expected to have an effect on future operations. Non-GAAP financial data is provided to facilitate meaningful period-to-period comparisons of underlying operational performance by eliminating infrequent or unusual charges. Similar non-GAAP financial measures, including return on invested capital (“ROIC”), are used for internal management assessments because such measures provide additional insight into ongoing financial performance. In particular, we provide ROIC because we believe it offers insight into the metrics that are driving management decisions as well as management’s performance under the tests that it sets for itself. Please refer to the attached reconciliations of non-GAAP supplemental data.

MARKET SECTOR BREAKOUT

Plexus reports revenue based on the market sector breakout set forth in the table below, which reflects the Company’s focus on its global business and market development sector strategy.

Market Sector	Q4 F10				Q3 F10
Wireline/Networking	$	222 M	40	%	$	223 M	42	%
Wireless Infrastructure	$	63 M	11	%	$	61 M	11	%
Medical	$	116 M	21	%	$	111 M	21	%
Industrial/Commercial	$	116 M	21	%	$	98 M	18	%
Defense/Security/Aerospace	$	39 M	7	%	$	43 M	8	%
Total Revenue	$	556 M			$	536 M

FISCAL Q4 SUPPLEMENTAL INFORMATION

• ROIC for both the fiscal fourth quarter and fiscal 2010 was 19.5%. The Company defines ROIC as tax-effected annualized operating income divided by average invested capital over a rolling five-quarter period. Invested capital is defined as equity plus debt, less cash and cash equivalents and short-term investments. In periods where restructuring or non-cash goodwill impairment charges were incurred, such as some quarters in fiscal 2009, we compute adjusted ROIC excluding these costs to better compare ongoing operations.

• Cash flow provided by operations was approximately $28 million for the quarter. Capital expenditures for the quarter were $27 million. Free cash flow was positive for the quarter, at approximately $1 million. Free cash flow for the year was negative, at approximately $73 million. The Company defines free cash flow as cash flow provided by (or used in) operations less capital expenditures.

• Top 10 customers comprised 57% of revenue during the quarter, up 3 percentage points from the previous quarter.

• Juniper Networks, Inc., with 16% of revenue, was the only customer representing 10% or more of revenue for the quarter.

• Cash Conversion Cycle:

Cash Conversion Cycle	Q4 F10	Q3 F10
Days in Accounts Receivable	51 Days	47 Days
Days in Inventory	90 Days	89 Days
Days in Accounts Payable	(66) Days	(61) Days
Annualized Cash Cycle	75 Days	75 Days

Conference Call/Webcast and Replay Information:

What:	Plexus Corp.’s Fiscal Q4 Earnings Conference Call
When:	Thursday, October 28th at 8:30 a.m. Eastern Time
Where:	(877) 312-9395 or (408) 774-4005 with conference ID: 14744811 http://tinyurl.com/2crqce4 (requires Windows Media Player)
Replay:	The call will be archived until November 4, 2010 at midnight Eastern Time http://tinyurl.com/2crqce4 or via telephone replay at (800) 642-1687 or (706) 645-9291 with conference ID: 14744811

For further information, please contact:
Ginger Jones, VP and Chief Financial Officer
920-751-5487 or ginger.jones@plexus.com

About Plexus Corp. — The Product Realization Company

Plexus (www.plexus.com) delivers optimized Product Realization solutions through a unique Product Realization Value Stream service model. This customer focused service model seamlessly integrates innovative product design, customized supply chain solutions, uniquely configured “focused factory” manufacturing, global end-market fulfillment and after-market services to deliver comprehensive end-to-end solutions for customers in the North American, European and Asia-Pacific regions.

Plexus is the industry leader in servicing mid-to-low volume, higher complexity customer programs characterized by unique flexibility, technology, quality and regulatory requirements. Award-winning customer service is provided to over 100 branded product companies in the Wireline/Networking, Wireless Infrastructure, Medical, Industrial/Commercial and Defense/Security/Aerospace market sectors.

Safe Harbor and Fair Disclosure Statement

The statements contained in this release which are guidance or which are not historical facts (such as statements in the future tense and statements including “believe,” “expect,” “intend,” “plan,” “anticipate,” “goal,” “target” and similar terms and concepts), including all discussions of periods which are not yet completed, are forward-looking statements that involve risks and uncertainties. These risks and uncertainties include, but are not limited to: the risk of customer delays, changes, cancellations or forecast inaccuracies in both ongoing and new programs; the poor visibility of future orders, particularly in view of current economic conditions; the economic performance of the industries, sectors and customers we serve; the effects of the volume of revenue from certain sectors or programs on our margins in particular periods; our ability to secure new customers, maintain our current customer base and deliver product on a timely basis; the risk that our revenue and/or profits associated with customers who are acquired by third parties will be negatively affected; the particular risks relative to new customers, including our arrangements with The Coca-Cola Company, which risks include customer and other delays, start-up costs, potential inability to execute, the establishment of appropriate terms of agreements, and the lack of a track record of order volume and timing; the risks of concentration of work for certain customers; our ability to manage successfully a complex business model characterized by high customer and product mix, low volumes and demanding quality, regulatory, and other requirements; the risk that new program wins and/or customer demand may not result in the expected revenue or profitability; the fact that customer orders may not lead to long-term relationships; the effects of the current constrained supply environment, which has led and may continue to lead to periods of shortages and delays in obtaining components based on the lack of capacity at some of our suppliers to meet increased demand, or which may cause customers to increase forecasts and orders to secure raw material supply or result in our inability to secure raw materials required to complete product assemblies; raw materials and component cost fluctuations particularly due to sudden increases in customer demand; the risks associated with excess and obsolete inventory, including the risk that inventory purchased on behalf of our customers may not be consumed or otherwise paid for by customer resulting in an inventory write-off; the weakness of the global economy and the continuing instability of the global financial markets and banking system, including the potential inability of our customers or suppliers to access credit facilities; the effect of changes in the pricing and margins of products; the effect of start-up costs of new programs and facilities, including our recent and planned expansions, such as our new replacement facility in Oradea, Romania, and our plans to further expand in Penang, Malaysia and other locations; the risk of unanticipated costs, unpaid duties and penalties related to an ongoing audit of our import compliance by U.S. Customs and Border Protection; possible unexpected costs and operating disruption in transitioning programs; the potential effect of world or local events or other events outside our control (such as drug cartel-related violence in Mexico, changes in oil prices, terrorism and war in the Middle East); the impact of increased competition; and other risks detailed in the Company’s Securities and Exchange Commission filings (particularly in Part I, Item 1A of our annual report on Form 10-K for the fiscal year ended October 3, 2009).

(financial tables follow)

PLEXUS CORP.
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
(in thousands, except per share data)
(unaudited)

	Three Months Ended						Twelve Months Ended
	October 2,			October 3,			October 2,			October 3,
	2010			2009			2010			2009
Net sales	$	555,632		$	392,975		$	2,013,393		$	1,616,622
Cost of sales		499,270			355,152			1,806,471			1,461,846
Gross profit		56,362			37,823			206,922			154,776
Operating expenses:
Selling and administrative expenses		27,352			23,034			107,270			93,138
Goodwill impairment costs		—			—			—			5,748
Restructuring costs		—			—			—			2,823
		27,352			23,034			107,270			101,709
Operating income		29,010			14,789			99,652			53,067
Other income (expense):
Interest expense		(2,253	)		(2,532	)		(9,589	)		(10,875	)
Interest income		293			472			1,436			2,323
Miscellaneous income (expense)		(823	)		192			(1,062	)		904
Income before income taxes		26,227			12,921			90,437			45,419
Income tax (benefit) expense		(380	)		(2,130	)		904			(908	)
Net income	$	26,607		$	15,051		$	89,533		$	46,327
Earnings per share:
Basic	$	0.66		$	0.38		$	2.24		$	1.18
Diluted	$	0.65		$	0.38		$	2.19		$	1.17
Weighted average shares outstanding:
Basic		40,396			39,503			40,051			39,411
Diluted		41,054			40,049			40,831			39,654

PLEXUS CORP.
NON-GAAP SUPPLEMENTAL INFORMATION
(in thousands, except per share data)
(unaudited)

Statements of Operations

	Three Months Ended						Twelve Months Ended
	October 2,			October 3,			October 2,		October 3,
	2010			2009			2010		2009
Net income — GAAP	$	26,607		$	15,051		$	89,533	$	46,327
Add: Income tax (benefit) expense		(380	)		(2,130	)		904		(908	)
Income before income taxes — GAAP		26,227			12,921			90,437		45,419
Add: Goodwill impairment costs		—			—			—		5,748
Restructuring costs*		—			—			—		2,823
Income before income taxes and excluding restructuring and impairment costs — Non-GAAP		26,227			12,921			90,437		53,990
Income tax (benefit) expense — Non-GAAP**		(380	)		(2,130	)		904		1,537
Net income — Non-GAAP	$	26,607		$	15,051		$	89,533	$	52,453
Earnings per share — Non-GAAP:
Basic	$	0.66		$	0.38		$	2.24	$	1.33
Diluted	$	0.65		$	0.38		$	2.19	$	1.32
Weighted average shares outstanding:
Basic		40,396			39,503			40,051		39,411
Diluted		41,054			40,049			40,831		39,654
*    Summary of restructuring costs
Restructuring costs:
Severance costs	$	—		$	—		$	—	$	1,948
Other exit costs		—			—			—		875
Total restructuring costs	$	—		$	—		$	—	$	2,823
**    GAAP to Non-GAAP Income Tax Disclosure:
GAAP income tax (benefit) expense	$	(380	)	$	(2,130	)	$	904	$	(908	)
Finalization of federal, state audits and change in state laws		—			—			—		1,377
Goodwill impairment costs		—			—			—		184
Severance costs		—			—			—		614
Other exit costs		—			—			—		270
Non-GAAP income tax (benefit) expense	$	(380	)	$	(2,130	)	$	904	$	1,537

PLEXUS CORP.
NON-GAAP SUPPLEMENTAL INFORMATION
(in thousands, except per share data)
(unaudited)

ROIC Calculation

	Twelve Months
	Ended
	October 2, 2010
Operating income	$	99,652
Add: Unusual (restructuring and impairment) charges		—
Operating income (excluding unusual charges)		99,652
Tax rate (excluding unusual charges)		x 1	%
Tax impact		- 997
Operating income (tax-effected)	$	98,655
Average invested capital	$	506,773
ROIC		19.5	%

																Average
																Invested
	Oct 2, 2010			Jul 3, 2010			Apr 3, 2010			Jan 2, 2010			Oct 3, 2009			Capital
Equity	$	651,855		$	620,619		$	585,954		$	549,618		$	527,446
Plus:
Debt — current		17,409			17,310			17,655			21,626			16,907
Debt — non-current		113,234			117,485			121,692			125,908			133,936
Less:
Cash and cash equivalents		(188,244	)		(190,203	)		(234,028	)		(233,931	)		(258,382	)
	$	594,254		$	565,211		$	491,273		$	463,221		$	419,907		$	506,773

PLEXUS CORP.
CONDENSED CONSOLIDATED BALANCE SHEETS
(in thousands, except per share data)
(unaudited)

	October 2,			October 3,
	2010			2009
ASSETS
Current assets:
Cash and cash equivalents	$	188,244		$	258,382
Accounts receivable		311,205			193,222
Inventories		492,430			322,352
Deferred income taxes		18,959			15,057
Prepaid expenses and other		15,153			9,421
Total current assets		1,025,991			798,434
Property, plant and equipment, net		235,714			197,469
Deferred income taxes		11,787			10,305
Other		16,887			16,464
Total assets	$	1,290,379		$	1,022,672
LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Current portion of long-term debt and capital lease obligations	$	17,409		$	16,907
Accounts payable		360,686			233,061
Customer deposits		27,301			28,180
Accrued liabilities:
Salaries and wages		46,639			28,169
Other		50,484			33,004
Total current liabilities		502,519			339,321
Long-term debt and capital lease obligations, net of current portion		113,234			133,936
Other liabilities		22,771			21,969
Total non-current liabilities		136,005			155,905
Shareholders’ equity:
Common stock, $.01 par value, 200,000 shares authorized, 47,849 and 46,994 shares issued, respectively, and 40,403 and 39,548 shares outstanding, respectively		478			470
Additional paid-in-capital		399,054			366,371
Common stock held in treasury, at cost, 7,446 shares for both periods		(200,110	)		(200,110	)
Retained earnings		445,568			356,035
Accumulated other comprehensive income		6,865			4,680
Total shareholders’ equity		651,855			527,446
Total liabilities and shareholders’ equity	$	1,290,379		$	1,022,672

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